This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Innovative Setting Bracket Design to Improve the Tractor Fit and Finish between the Bonnet and Custer Panel (Scuttle)
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 25, 2020 by SAE International in United States
Annotation ability available
Event: International Conference on Advances in Design, Materials, Manufacturing and Surface Engineering for Mobility
Innovative setting bracket design to improve the tractor Fit and Finish between the Bonnet and Custer panel (Scuttle)
The paper presents an integrated approach for arriving a process to assemble scuttle regarding bonnet to achieve Gap and flushness aesthetic requirement. Variation is inevitable due to fitting of bonnet on Tractor front semi-chassis, scuttle fitting on tractor middle clutch housing and assembling many parts with different tolerances, hence the deviation (stack-up) obtained after their assembly varies from approximately -10.175 to 9.775 mm. This is quite large and gives a huge impact in aesthetic point of view.
To overcome this issue, we introduced one Innovative intermediate bracket as the setting gauge which is assembled with reference to bonnet and scuttle is mounted on this setting bracket hence zero flushness and uniform achieved between bonnet and scuttle.
This mechanism also decreases assembly tag time (which plays a vital role in mass production) as well as helps in identifying process failures in assembly. This in turn reduces cost as well as reduces assembly operator pain area.
Apart from these aspects tolerance between them vary from design to design but it is usually kept at around 6mm (to provide a smooth motion). In present work, a gauging technique is suggested for minimizing the variance in tolerance. Utilization of metrology system also results in decreasing investment cost and provide high accuracy.
CitationSAMBANDAM, K., "Innovative Setting Bracket Design to Improve the Tractor Fit and Finish between the Bonnet and Custer Panel (Scuttle)," SAE Technical Paper 2020-28-0479, 2020.
- Glancy, C.G. and Chase, K.W. , “A Second-Order Method for Assembly Tolerance Analysis,” in ASME Design Engineering Technical Conferences, ASME, Las Vegas, NV, 1999, 1-8.
- Gao, J., Chase, K.W., and Magleby, S.P. , “Comparison of Assembly Tolerance Analysis by the Direct Linearization Method and Modified Monte Carlo Simulation Methods,” in ASME Design Engineering Tech. Conference, 1995, 353-360.
- Hu, M., Lin, Z., Lai, X., and Ni, J. , “Simulation and Analysis of Assembly Processes Considering Compliant, Non-Ideal Parts and Tooling Variations,” International Journal of Machine Tools & Manufacture 41:2233-2243, 2001.
- Charles Liu, S., and Jack Hu, S. , “An Offset Finite Element Model and Its Applications in Predicting Sheet Metal Assembly Variation,” Int. J. Mach. Tools Manufact. 35(11), 1994.
- Manarvi, I.A., and Juster, N.P. , “Framework of an Integrated Tolerance Synthesis Model and Using FE Simulation as a Virtual Tool for Tolerance Allocation in Assembly Design,” Journal of Materials Processing Technology 182-193, 2004.